Pump



Jan. 8, 1963 G. P. KENNEDY ETAL 3,072,066

PUMP Filed April '7, 1958 4 Sheets-Sheet 1 D g: Gar/h I? Kennedy Q 7 Q Charles M. Corken I E/do 0. Heim BY WW 29% l 1 INVENTORS l l I Jan. 8, 1963 e. P. KENNEDY ETAL 3,072,066

PUMP

Filed April '7, 1958 4 Sheets-Sheet 2 I28 I46 I48 54 Gar/h F. Kennedy Charles M. Cor/ran E/a'o D. Heim INVENTORS Jan. 8, 1963 Filed April '7, 1958 G. F. KENNEDY ETAL PUMP 4 Sheets-Sheet 3 Garth P. Kennedy Charles M. Corken E [d0 D- Heim VINVENTORS Fig.5

1963 G. P. KENNEDY ETAL 3,072,066

PUMP

4 Sheets-Sheet 4 Filed April 7, 1958 Garth R Kennedy Charles M. Corken E Ida D. Heim I IN VEN TORS 7 Q BY M40163 United States atent Patented Jan. 8, 1%63 free 3,072,066 RUM? Garth P. Kennedy, Charles M. Corlren, and Eldo D. Heim, Gltlahoma Qity, Okla, assignors to Corkens Inc, @klahoma Qity, Glda, a corporation or tlhlahoma Filed Apr. 7, 1958, Ser. No. 726,755 3 Claims. (Cl. 1tl3--ll36) This invention relates to pumps and particularly to improvements in the construction and operation of pumps and especially, a rotary pump.

The ordinary slidin vane rotary pump has been available for a number of years. The same principles of operation have been relied on to deliver fluid from an inlet through a pump chamber to an outlet. This invention provides improvements for the construction of such pumps and the ensuing operation is correspondingly improved. One of the objects of this invention is to provide a pump with cartridges that each contain a bearing and at least one seal for the support and sealing of the pump shaft. In a rotary pump bearing loads are important. In order to easily install and remove for servicing the bearing, this pump has made it possible to merely remove a single bearing cap for each cartridge, and then slip the cartridge from the cavity within which the cartridge is ordinarily supported. An appreciable saving in time, labor and money is achieved by having the bearings and retainers in the form of cartridges that are easily removed from the pump and easily replaced.

In the operation of a pump, it occasionally happens that the pump outlet becomes closed or blocked for one reason or another. The result is that the pump becomes unloaded and runs hot. Sometimes the fluid being pumped vaporizes and the pump operates under a vapor locked condition. Either condition is detrimental to the pump. A further object of the invention is to provide an external by-pass which connects with the pump chamber preferably near the outlet of the pump. This by-pass is connected to the pump supply so that there is always a small amount of recirculation. The purpose is to recirculate a small amount of fluid back to the supply tank in the event that the discharge side of the pump is closed for any reason. This small amount of fluid will permit the pump to operate at extended intervals with the discharge completely closed without overheating the pump and without causing the liquid being circulated to vaporize and thereby permit the pump to operate vapor locked.

An adjustable pressure opened valve is in the by-pass thereby enabling the quantity of fluid recirculated to be adjusted in accordance with pump pressure.

Although prior pumps have each had to be mounted on bases or mounting brackets, an important feature of this invention is an almost completely universal mounting bracket system. A specially constructed mounting bracket is arranged with the base and a support. The support may be attached to either side of the pump case or may be installed with the base under the pump or protruding laterally from the pump. Moreover, the means attaching the pump case to the upstanding support enable the pump case to be rotationally adjusted, and this is a great assistance in aligning a truck pump with the piping to and from a truck tank. Other object and features of importance will become apparent in following the description of the illustrated form of the invention.

FIGURE 1 is an elevational view of the pump showing the fluid inlet side thereof.

FIGURE 2 is an end view of the pump in FIG- URE 1.

FIGURE 3 is an elevational view showing one mechanical drive connected with the pump and showing the pump mounted in one of a number of selected positions.

FIGURE 4 is an enlarged sectional view taken on the line 4-4 of FIGURE 2.

FIGURE 5 is a sectional view taken on the line 5-5 of FIGURE 4.

FIGURE 6 is an enlarged fragmentary sectional view showing a part of the by-pass including the by-pass valve of the pump.

FIGURE 7 is an exploded perspective view of one cartridge having a rotor shaft bearing and seal.

FIGURE 8 is an exploded perspective: view of some of the parts which are assembled to form the pump.

In the accompanying drawings there is a pump 10. The illustration is of a sliding vane rotary pump whose major parts are in part shown in FIGURE 8. Referring first to these parts, there is pump case 12 together with heads or end pieces 14 and 16, one only shown in FIG- URE 8. Rotor 18 has shaft 20 to which rotor body 22 is fixed. Radial slots 24 are in the body 22 and they accommodate vanes 26 capable of sliding in and out of the slots as the rotor is operated. Cam 28 has an inner surface over which the outer edges of vanes 26 are moved.

Side plates 36: and 32 have central apertures through which shaft 2t) passes and they are on opposite sides of the cam 28. Head 14 is on one side of the case 12 While head 16 is on the other side and each is bolted in place. All confronting surfaces are sealed by O-rings or corresponding gaskets or gasket material where required. For example, O-ring 34 is fitted in a groove between a flange of head 14 and a part of the case 12 to seal head 14. An identical O-ring 36 seals head 16.

Two bearing cartridges or units 36 and 40 (FIGURE 4) are located in cavities i2 and 44 of heads 14 and 16. These are held in place by bearing caps 46 and 48 that are bolted to the outer ends of heads 14 and 16. Seals, for example, O-rings 4-9 and 5t? are interposed be tween the bearing caps, the cartridges and heads to assure complete sealing at the junctions of these parts. Rotor shaft 20 to which rotor body 22 is keyed, for example by key 54, is mounted for rotation in the car tridges it and 33 and passes completely therethrough, leaving both ends of the shaft free for attachment with an external source of power. Splines, keyways or other conventional means for coupling the shaft 20 to the external source of power may be used.

There are two valves 56 and 58 respectively that are in registry with the pump chamber or passageway 64 in case 12. Valve 56 is a pressure relief valve which permits fluid under pressure near the pump outlet to return to the inlet part of chamber 69. Valve 58 constitutes a part of the by-pass 62 which bleeds a small quantity of fluid from the pump chamber 69 and returns it to the supply from which the fluid is being drawn. The purpose of the bypass has been described previously.

Referring now to the pump in more detail, casing 12 is generally cylindrical. It has sides 66 and 63 whose face form surfaces against which smooth faces of heads 14 and 1d abut. There are two pockets 7% and 72 that open inwardly of the case and which are separated by divider 74. Pocket '72 registers with the pump inlet 76 with which inlet conduits 78 is connected. Pocket is registered with the outlet 89 that is adapted to be connected to any piping for delivering the pump fluid. The pump case 12 can be constructed of a casting with built-up parts at the inlet and outlets and also in the region of the relief valve 56 and by-pass 62. Plugs 81 and 82 are in openings in these last mentioned parts and they can be removed for receiving two pressure gauges, one indicating pump suction and the other indicating pump discharge pressure. The pockets "7d and 72 constitute a part of the pump chamber 68, this being in the aovaoee U form of a passageway that communicates the pump inlet 76 with the pump outlet 80.

Cam 2% has rotor 1% installed in it. It is eccentric to the axis of rotation of Shaft 24 and has two groups of slots 99 and 2 therein. The slots register respectively with pockets 70 and 72. The inside surface of the gen erally cylindrical cam 28 is smooth and has the outer ends of vanes 26 wiping thereon as the rotor is operated. End plates so and 32 are installed on opposite sides of the cam 28 (FIGURE 4) and are held in place by the inner ends of heads 14 and 16. Keyways 93, M and are in the periphery of side planes 32 and 3t and cam 28. A key 96 is located in the keyways and anchored to the heads thereby preventing the cam and end plates 30 and 32 from rotating.

Heads 14 and 16 have bolting flanges by which they are attached to the case surfaces 66 and 68. They also have cylindrical parts 97 and 98 which form cavities 42 and 44 in which cartridges 40' and 38 are disposed. EX- cluding the installation of these cartridges 38 and at the ext parts installed are the bearing caps 46 and 48. Each has a pair of grease relief openings M that ordinarily have plugs in them. They each have central openings accommodating grease retainers 102 and 194 through which the main shaft 24 of the rotor is passed.

Cartridge 4i slides into and is removable from cavity 42 by merely removing the bearing cap 46. The cartridge contains anti-friction bearing 118 that is mounted on the larger diameter part 112 of seal sleeve 114. Flange 116 of sleeve 114 has sleeve clamp collar 118 (FIGURE 8) bolted thereto with an O-ring and/or packing 129 on shaft 20 behind collar 11S and within a circumferential groove in the bore of sleeve 1E4. Bearing housing 124 fits over the bearing 110 and bearing housing retainer ring 126 is snapped into an annular groove formed in the side wall of housing 124- holding the bearing 110 assembled therein. Stop ring which is actually a bearing sleeve retaining ring 128 is fitted in a groove of sleeve 114 and abuts the inner face of the inner race of an antifriction bearing llltl (FIGURE 4).

The reduced diameter part 132 of sleeve 1M accommodates a seal 136. The seal consists of a stationary face 140 with a stationary face O-ring 142 in a groove therein. Rotating face 146 in the form of a collar, is also fitted on the reduced diameter part 132 of the sleeve lid and abuts the stationary face. Seal sleeve retainer ring 148 is on the end of sleeve 132, fitting in a groove therein. Packing or an O-ring 15%, is located between ring 148 and the inner surface of rotating face 14-6. Cage 154 is on the rotating face 14 and is held in place and as a part of the rotating face of the seal by retaining ring 143.

Seal 146 excludes fluid from bearing 11% while the shaft 2% is amply sealed by retainer taz, O-ring 120 and the presence of sleeve 112 thereon.

Relief valve 56 (FIGURES and 8) is constructed of a cylindrical valve element are which has the form of a cup. It is on valve seat 162 that is between the pressure and suction parts of the passageway or pump chamber 6t). Spring Tea is disposed in the cup-shaped valve element 160 and abuts stop 166 that is supported on adjustment screw 16%. The head of the screw contacts closure 170 over the open end of the relief valve chamber 172. thereby providing a reaction for the spring 164. The relief valve 56 is made in such a way as to discourage tampering by having the screw 158 concealed beneath closure 170. However, access plug 178 is in the closure 17% for the principal purpose of adjusting the pump relief valve 56 at the factory specification. Adjustment may be considered desirable when the pump handles fluids of dilferent viscosity.

Theby-pass valve 58 that constitutes part of by-pass 62 is of considerable importance. Conductor 1% is a passage that registers with the pump chamber 69 near the outlet 89 or at some other place in the high pressure part thereof. The conductor 1 5i) is communicated with an outlet 182 to which conduit 184 is attached. A pressure opened valve 186 functioning as relief valve 58, is in the network of conductors (FIGURE 6) and controls the passage of fluid from chamber 64} to the conduit 184. Valve 186 is made of a small case 1&3 threaded in bore 189 and having spring 190 disposed therein. One end of the spring is seated on shim 192 While the other end of the spring is seated on valve element 1%. This element is constrained in its travel within bore 189 by abutting valve seat on shoulder 1% in this bore. A washer can be on the inner end of the valve element and constitute a part of it. Adjustment is achieved by altering the shims 192 and/or adjustment of small case 18 The by-pass has a small quantity of the fluid conducted from chamber as and delivered to conduit 184 that connects to the supply. This assures that there will be at all times at least a small quantity of fluid handled by the pump regardless of where the outlet St is partially or even fully closed.

In FIGURE 3 a typical pump installation is shown. The source 200 of power drivingly connects to shaft 20 by an extensible shaft 262 that is coupled at its ends to the power output shaft 204 and to pump shaft 20 respectively by universal joints and couplings. This figure shows that both ends of the pump have a part of shaft 20 available for driving a pump. Moreover, this figure shows only one method of mounting the pump. Mounting bracket 21% in this figure is shown more in detail than FIGURES 1 and 2. It consists of a flat plate 212 that constitutes a support and which has a group of arcuate slots 214 near its periphery. There is a central aperture 216 through which the cylindrical part 98 of head 16 is passed. Bolts 218 are passed through the slots 214 and are attached to the mounting flange of head 14. The bolts 218 can be long enough to enter tapped holes in the case 12. In either event the support is capable of holding the pump case in selected degrees of orientation with the limit being established by the length of slots 214. This is of great assistance in aligning the pump with existing pipes, for example, on a truck.

Base 226 protrudes laterally from the lower part of the support. This base can be bolted down or can be otherwise fastened in place. Actually, the base may simply rest on a supporting surface, these being alternative which will depend on the particular application of the pump. By having the base protrude essentially only from one side of support 212, the base can be reversed (see FIG- URE l) for left-hand and right-hand installation. This, coupled with the orientation adjustment of the pump case enables the pump to be adjusted to an exceedingly large number of positions.

The pumping action takes place by movement of the rotor in cam 23 in a fashion that is Well-known. The sliding vane rotary type pump has been common for a number of years. The described pump, though has the improvements that have been pointed out and discussed. It is understood that this invention is not limited to the exact details of construction which are shown and described. All modifications that fall within the scope of the following claims may be resorted to.

What is claimed as new is as follows:

1. In a rotary pump which has a hollow open ended case provided with an inlet, an outlet, a conducting passageway communicating said inlet with said outlet and a sliding vane rotor to deliver fluid from said inlet into said passageway and through said outlet, a cam in said case having an inner surface over which the rotor vanes slide, said cam having passages which form a portion of said passageway, side plates disposed over the opposite ends of said case on opposite ends of said rotor enclosing the latter within said case and having their confronting surfaces closely embracing the opposite ends of said rotor, each of said side plates having a central aperture formed therein, removable end pieces secured to said case over said side plates and securing the latter to said case, said end pieces having outwardly opening cavities in axial alignment with said side plate apertures, a rotor shaft connected to said rotor and extending through said apertures and having remote end portions thereof in said cavities, combined unitary bearing and seal cartridges removably received in said cavities and mounting said shaft for rotation, and outer bearing caps removably secured to said end pieces and forming cavity end closures comprising the sole means for enclosing said cartridges in said cavities, a support base carried by one of said end pieces for supporting said pump, a plurality of circumferentially spaced arcuate slots in said one and piece having the axis of rotation of said shaft as their center, fasteners secured through and slidable longitudinally of said slots and secured in said case, said inlet and outlet each having a longitudinal axis extending substantially at right angles to said shaft.

2 The combination of claim 1 wherein each of said unitary bearing and seal cartridges includes a bearing for journaling a part of said shaft and a fluid seal mounted inwardly of said bearing for excluding excess of the fluid being handled by said pump to said bearing.

3. The combination of claim 2 wherein each of said beaning caps is provided with lubricating means for maintaining the supply of lubricant for the corresponding bearing, and seal means in each of said caps outwardly of said lubricating means and engaging said shaft preventing the entrance of foreign material into said bearing and the loss of lubricant from said bearing outwardly of said shaft.

References Cited in the file of this patent UNITED STATES PATENTS 656,023 Keeney Aug. 14, 1900 963,690 Curtis July 5, 1910 1,079,384 Wilson Nov. 25, 1913 1,675,079 Zisch June 26, 1928 1,881,680 Klosson Oct. 11, 1932 1,940,384 Zoller Dec. 19, 1933 2,151,730 Basebe et al Mar. 28, 1939 2,193,504 Antrim et al Mar. 12, 1940 2,216,053 Staley Sept. 24, 1940 2,273,214 McConaghy Feb. 17, 1942 2,462,481 Estey Feb. 22, 1949 2,487,449 Knudson Nov. 8, 1949 2,609,256 Barker et al Sept-2, 1952 2,623,471 Hartmann Dec. 30, 1952 2,625,108 Logan Jan. 13, 1953 2,649,737 Hoen et al Aug. 25, 1953 2,697,645 Mitchell Dec. 21, 1954 2,717,770 Gibson et al Sept. 13, 1955 2,808,981 Levy Oct. 8, 1957 FOREIGN PATENTS 338,017 France Mar. 7, 1904- 783,913 Great Britain Oct. 2, 1957 

1. IN A ROTARY PUMP WHICH HAS A HOLLOW OPEN ENDED CASE PROVIDED WITH AN INLET, AN OUTLET, A CONDUCTING PASSAGEWAY COMMUNICATING SAID INLET WITH SAID OUTLET AND A SLIDING VANE ROTOR TO DELIVER FLUID FROM SAID INLET INTO SAID PASSAGEWAY AND THROUGH SAID OUTLET, A CAM IN SAID CASE HAVING AN INNER SURFACE OVER WHICH THE ROTOR VANES SLIDE, SAID CAM HAVING PASSAGES WHICH FORM A PORTION OF SAID PASSAGEWAY, SIDE PLATES DISPOSED OVER THE OPPOSITE ENDS OF SAID CASE ON OPPOSITE ENDS OF SAID ROTOR ENCLOSING THE LATTER WITHIN SAID CASE AND HAVING THEIR CONFRONTING SURFACES CLOSELY EMBRACING THE OPPOSITE ENDS OF SAID ROTOR, EACH OF SAID SIDE PLATES HAVING A CENTRAL APERTURE FORMED THEREIN, REMOVABLE END PIECES SECURED TO SAID CASE OVER SAID SIDE PLATES AND SECURING THE LATTER TO SAID CASE, SAID END PIECES HAVING OUTWARDLY OPENING CAVITIES IN AXIAL ALIGNMENT WITH SAID SIDE PLATES APERTURES, A ROTOR SHAFT CONNECTED TO SAID ROTOR AND EXTENDING THROUGH SAID APERTURES AND HAVING REMOTE END PORTIONS THEREOF IN SAID CAVITIES, COMBINED UNITARY BEARING AND SEAL CARTRIDGES REMOVABLY RECEIVED IN SAID CAVITIES AND MOUNTING SAID SHAFT FOR ROTATION, AND OUTER BEARING CAPS REMOVABLY SECURED TO SAID END PIECES AND FORMING CAVITY END CLOSURES COMPRISING THE SOLE MEANS FOR ENCLOSING SAID CARTRIDGES IN SAID CAVITIES, A SUPPORT BASE CARRIED BY ONE OF SAID END PIECES FOR SUPPORTING SAID PUMP, A PLURALITY OF CIRCUMFERENTIALLY SPACED ARCUATE SLOTS IN SAID ONE END PIECE HAVING THE AXIS OF ROTATION OF SAID SHAFT AS THEIR CENTER, FASTENERS SECURED THROUGH AND SLIDABLE LONGITUDINALLY OF SAID SLOTS AND SECURED IN SAID CASE, SAID INLET AND OUTLET EACH HAVING A LONGITUDINALLY AXIS EXTENDING SUBSTANTIALLY AT RIGHT ANGLES TO SAID SHAFT. 